CALIFORNIA ACADEMY OF SCIENCES. 39 



hypha very short, brown; spores cylindrical, attenuate 

 above, brown, 5 — 13-septate. fx 16 X 130. 



On living leaves of Heteromeles arbutifolia. Berkeley, 



September. 3424. 



Cercospora Rafinesquiae. 



Hypophyllous; in minute tufts covering a great part of 

 the leaf; hypha brown, very short; spores oblong, brown, 

 2— 7 -septate. yu 20—30 X 6. 



On living leaves of Rafmesquia Californica. San Fran- 

 cisco, May. 2603. 



Beltrania»querna. 



Hypha erect, growing in tufts, becoming confluent, brown, 

 2 — 4-septate bearing at the apex 1 — 2 whorls of bud-like pro- 

 cesses, the outer border fringed with 2 — 5 dentations, to each 

 of which a spore is attached : spores obscurely rhomboid, 

 rounded at the basal, and rostrate at the free end, brown, 

 granular, obscurely septate, at length dividing at the wide- 

 est part; setuhe black, much exceeding the hypha, septa 

 none or invisible, jn 17 — 28 X 8 — 10. 



Forming a dense black stratum on decaying leaves of 

 Quercus agrifolia. San Francisco, Jan. 2191. 



TR0P0SP0RIUM, nov. gen. 



Sporodochium flattened, farinaceous. Hypha elongated, 

 lax, branching. Spores spiral, attached to the hypha by slen- 

 der pedicel-like branchlets. 



Allied to Fusisporium, but with very different spores. 



Troposporium album. 



Acervuli white, 1—2 mm, often confluent, thick, branching 

 freely, without septa, containing numerous granules and oil 

 globules which are set free by breaking; spore — a long- 

 tube granular, nucleolate without septa, n 7 wide, coiled 

 in a long spiral of 3 — 7 turns, flattened at the crossings, 



